Building on #10102, this adds an -ipcconnect option to bitcoin-wallet and an -ipcbind option to bitcoin-node (both enabled by default in multiprocess builds) so bitcoin node will listen on a <datadir>/sockets/node.sock unix socket, and bitcoin-wallet will connect to it.
The idea is that bitcoin-wallet can be extended in the future to have some online functionality. For example, there could be a bitcoin-wallet sync command that will update balances and sync latest transactions to an unloaded wallet, or a bitcoin-wallet serve subcommand that loads a wallet and serves RPC requests, or a bitcoin-wallet shell subcommand that allows running RPC methods interactively like the GUI console, or just general support for bitcoin-wallet <rpc method> <rpc params> invocations suggested #13926 (comment).
This PR is small and doesn’t do much. The only visible change is that bitcoin-wallet now checks whether a node socket exists on startup and prints “Connected to IPC address” if it can connect it it.
The default bitcoin-wallet connect option is -ipcconnect=auto, which connects if possible as described above, and proceeds offline if not possible. Other supported options are -noipcconnect to disable ipc, -ipcconnect to require a connection and fail if it can’t be established, and -ipcconnect=unix:<socket> to require a connection and use a custom socket path.
These changes require multiprocess support and this PR has no effect unless bitcoin is configured with --enable-multiprocess as described in doc/multiprocess.md
#25722 (refactor: Use util::Result class for wallet loading by ryanofsky)
#25665 (refactor: Add util::Result failure values, multiple error and warning messages by ryanofsky)
If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.
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ryanofsky
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jonasschnelli
commented at 8:02 am on December 18, 2020:
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Impressive change. Again!
Conceptual I’m not yet convinced.
My understanding is/was that bitcoin-wallet is an offline wallet exploring and manipulation tool without the requirement of a node or online connectivity.
Things that require a node, should IMO go into wallet RPC calls.
But my conceptual understanding might be old and rusty (happy to get convinced).
Things like bitcoin-wallet shell would be nice though. I guess we would just need to make sure the IPC/node option is completely optional and thus the offline functionality (for things that can work offline) is still guaranteed.
Or is this also an attempt to decouple the wallet from the node (in the long run)?
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ryanofsky
commented at 11:34 am on December 18, 2020:
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My understanding is/was that bitcoin-wallet is an offline wallet exploring and manipulation tool without the requirement of a node or online connectivity.
To address any concern here, there’s no thought of changing this. This PR gives bitcoin-wallet tool ability to do online things as well as offline things. It doesn’t require a node or take away the ability to do offline things. Even if you require separate bitcoin-wallet-online-stuff and bitcoin-wallet-offline-only binaries, it only needs build changes not code changes (a new automake entry and src/init/bitcoin-wallet-offline-only.cpp stub)
Make sure to run all tests locally, according to the documentation.
The failure may happen due to a number of reasons, for example:
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affected test.
An intermittent issue.
Leave a comment here, if you need help tracking down a confusing failure.
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Add capnp serialization code for bitcoin types
- Add capnp ToBlob, ToArray, Wrap, Serialize, and Unserialize helper functions
- Add support for std::chrono::seconds capnp serialization
- Add support for util::Result capnp serialization
Add `-ipcconnect` option to `bitcoin-wallet` to allow connecting to a bitcoin
node process over IPC. The `bitcoin-wallet` tool doesn't really do anything with its
connection to the node yet, but it could potentially run or serve RPCs that
require being online.
Example usage:
src/bitcoin-node -regtest -debug -ipcbind=unix
src/bitcoin-wallet -regtest -ipcconnect=unix info
9ac7b38d94
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